 /*******************************************************************************
  * Copyright (c) 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.texteditor.rulers;

 import org.eclipse.core.runtime.Assert;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.core.runtime.content.IContentType;

 /**
  * Describes the target of a contribution to the <code>org.eclipse.ui.texteditor.rulerColumns</code>
  * extension point.
  *
  * @since 3.3
  */
 public abstract class RulerColumnTarget {
     public abstract boolean matchesEditorId(String editorId);
     public abstract boolean matchesContentType(IContentType contentType);
     public abstract boolean matchesClass(Class clazz);

     /* package visible */
     RulerColumnTarget() {
     }

     public static RulerColumnTarget createAllTarget() {
         return new AllTarget();
     }

     public static RulerColumnTarget createOrTarget(RulerColumnTarget either, RulerColumnTarget or) {
         Assert.isLegal(or != null || either != null);
         if (either == null)
             return or;
         if (or == null)
             return either;
         return new OrTarget(either, or);
     }

     public static RulerColumnTarget createContentTypeTarget(String contentTypeId) {
         return new ContentTypeTarget(contentTypeId);
     }

     public static RulerColumnTarget createEditorIdTarget(String editorId) {
         return new EditorIdTarget(editorId);
     }

     public static RulerColumnTarget createClassTarget(String className) {
         return new ClassTarget(className);
     }
 }

 final class AllTarget extends RulerColumnTarget {
     AllTarget() {
     }

     public boolean matchesContentType(IContentType contentType) {
         return true;
     }

     public boolean matchesEditorId(String editorId) {
         return true;
     }

     public boolean matchesClass(Class clazz) {
         return true;
     }

     public String toString() {
         return "All"; //$NON-NLS-1$
 }
 }

 final class OrTarget extends RulerColumnTarget {
     private final RulerColumnTarget fEither;
     private final RulerColumnTarget fOr;

     OrTarget(RulerColumnTarget either, RulerColumnTarget or) {
         fEither= either;
         fOr= or;
         Assert.isLegal(either != null);
         Assert.isLegal(or != null);
     }

     public boolean matchesContentType(IContentType contentType) {
         return fEither.matchesContentType(contentType) || fOr.matchesContentType(contentType);
     }

     public boolean matchesEditorId(String editorId) {
         return fEither.matchesEditorId(editorId) || fOr.matchesEditorId(editorId);
     }

     public boolean matchesClass(Class clazz) {
         return fEither.matchesClass(clazz) || fOr.matchesClass(clazz);
     }

     public String toString() {
         return fEither.toString() + " || " + fOr.toString(); //$NON-NLS-1$
 }
 }

 final class EditorIdTarget extends RulerColumnTarget {
     private final String fEditorId;

     EditorIdTarget(String id) {
         Assert.isLegal(id != null);
         fEditorId= id;
     }

     public boolean matchesContentType(IContentType contentType) {
         return false;
     }

     public boolean matchesEditorId(String editorId) {
         return fEditorId.equals(editorId);
     }

     public boolean matchesClass(Class clazz) {
         return false;
     }

     public String toString() {
         return "editorID=" + fEditorId; //$NON-NLS-1$
 }
 }

 final class ClassTarget extends RulerColumnTarget {
     private final String fClassName;

     ClassTarget(String className) {
         Assert.isLegal(className != null);
         fClassName= className;
     }

     public boolean matchesContentType(IContentType contentType) {
         return false;
     }

     public boolean matchesEditorId(String editorId) {
         return false;
     }

     public boolean matchesClass(Class clazz) {
         Assert.isLegal(clazz != null);
         
         do {
             if (clazz.getName().equals(fClassName))
                 return true;
             clazz= clazz.getSuperclass();
         } while (clazz != null);

         return false;
     }

     public String toString() {
         return "class=" + fClassName; //$NON-NLS-1$
 }
 }

 final class ContentTypeTarget extends RulerColumnTarget {
     private final IContentType fContentType;

     ContentTypeTarget(String contentTypeId) {
         Assert.isLegal(contentTypeId != null);
         fContentType= Platform.getContentTypeManager().getContentType(contentTypeId);
     }

     public boolean matchesContentType(IContentType contentType) {
         return fContentType != null && contentType != null && contentType.isKindOf(fContentType);
     }

     public boolean matchesEditorId(String editorId) {
         return false;
     }

     public boolean matchesClass(Class clazz) {
         return false;
     }

     public String toString() {
         return "contentType=" + fContentType; //$NON-NLS-1$
 }
 }

